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More than 95 million high-tech scans are done each year, and medical imaging, including CT, M.R.I. and PET scans, has ballooned into a $100-billion-a-year industry in the United States, with Medicare paying for $14 billion of that. But recent studies show that as many as 20 percent to 50 percent of the procedures should never have been done because their results did not help diagnose ailments or treat patients.

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Insurers do not distinguish between scans that are done poorly or done well or read by less- or more-qualified doctors. Aside from mammography, whose standards were established by a law that went into effect more than a decade ago, the field is largely unregulated. And increasingly, doctors refer patients to scanning centers they own and profit from.

You'll recall that Rep. Lindsley Smithgot nowhere recently with a bill to prohibit doctors from referring patients to their own scanning centers.

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